The debate whether cell phones can cause cancer has been debated for years. Up until today, WHO has said no adverse effects of cell phone use had been established.

It's difficult to study the effects of long-term exposure and make conclusions, said Dr. Keith Black, chairman of neurology at Cedars-Sinai Medical
Center in Los Angeles, in an article from CNN. He said,

The biggest problem we have is that we know most environmental factors
take several decades of exposure before we really see the consequences

While there is not fully conclusive data, Dr. Jonathan Samet, a University of Southern California epidemiologist who chaired the
panel of experts said in the press release:

The evidence, while still accumulating, is strong enough to support a conclusion. There could be some risk, and therefore we need to
keep a close watch for a link between cell phones and cancer risk.

The team that released the report consists of 31 scientists from 14 countries who studied peer-reviewed studies on cell phone
safety.